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      Low-Order Modeling of Dynamic Stall on Airfoils in Incompressible Flow

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          Abstract

          Airfoil dynamic stall in incompressible flow is characterized by two interacting viscous flow phenomena: time-varying trailing-edge separation and the shedding of intermittent leading-edge-vortex structures. In the current work, a physics based low-order method capable of modeling the interactions between the two flow phenomena is developed with the aim of predicting dynamic stall with only a few empirical tuning parameters. Large computational datasets are used to understand the flow physics of unsteady airfoils so as to augment an inviscid, unsteady airfoil theory to model the time-dependent viscous effects. The resulting model requires only three empirical coefficients for a given airfoil and Reynolds number, which could be obtained from a single moderate-pitch-rate unsteady motion for that airfoil/Reynolds number combination. Results from the low-order model are shown to compare excellently with computational and experimental solutions, in terms of both aerodynamic loads and flow-pattern predictions. In addition to formulating a method with limited empirical dependencies, the current research provides valuable insights into the flow physics of unsteady airfoils and their connection to rapidly predictable theoretical parameters.

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          Most cited references50

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          Über die Entstehung des dynamischen Auftriebes von Tragflügeln

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            A Semi-Empirical Model for Dynamic Stall

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              Dynamic Stall Experiments on Oscillating Airfoils

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                Author and article information

                Contributors
                Conference
                aiaaj
                AIAA Journal
                AIAA Journal
                American Institute of Aeronautics and Astronautics
                1533-385X
                07 September 2022
                January 2023
                : 61
                : 1
                : 206-222
                Affiliations
                North Carolina State University , Raleigh, North Carolina 27695
                Author notes
                [*]

                Teaching Assistant Professor, Department of Mechanical and Aerospace Engineering; currently Assistant Professor, Mississippi State University, Mississippi State, Mississippi 39762; snarsipur@ 123456ae.msstate.edu. Senior Member AIAA.

                [†]

                Professor, Department of Mechanical and Aerospace Engineering, agopalar@ 123456ncsu.edu . Associate Fellow AIAA.

                [‡]

                Professor, Department of Mechanical and Aerospace Engineering; jredward@ 123456ncsu.edu . Fellow AIAA.

                Author information
                https://orcid.org/0000-0002-1768-8230
                https://orcid.org/0000-0002-1119-7887
                Article
                J061595 J061595
                10.2514/1.J061595
                a7bffaab-1dd1-435f-9153-3afc2afe5a04
                Copyright © 2022 by the authors. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-385X to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.
                History
                : 20 February 2022
                : 12 August 2022
                : 15 August 2022
                Page count
                Figures: 23, Tables: 1
                Funding
                Funded by: Army Research Officehttp://dx.doi.org/10.13039/100000183
                Award ID: W911NF-13-1-0061
                Categories
                Regular Articles

                Engineering,Physics,Mechanical engineering,Space Physics
                Engineering, Physics, Mechanical engineering, Space Physics

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